JP5357844B2 - Rock fall protection net structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rock fall protective net structure capable of preventing excessive loads by snow accumulation from being applied to a net body. <P>SOLUTION: A net body 3 is hung on a slope S, and the net body 3 includes horizontal rope materials 5, 5...5A, 5A provided in a plurality of stages vertically at intervals and a wire net 6 which is a net covering the horizontal rope materials 5, 5...5A, 5A. Since the interval K of the horizontal rope materials 5A, 5A on the lower stage side is made narrower than the interval K of the horizontal rope materials 5, 5 on the upper end side, supporting is performed by the horizontal rope materials 5A, 5A for which the interval K is narrowed on the lower side of the net body 3 where the large snow accumulation loads are applied, and thus not only rock fall but also the snow accumulation loads in a winter season can be coped with. Also a static load length adjuster 8A is provided to frictionally slide the horizontal rope material 5A on the lower stage side and extend the horizontal rope material 5A on the lower stage side when prescribed or more tension is made to act by the static loads of the snow accumulation. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a rockfall protection net structure installed to prevent accidents caused by rockfall on a slope.

  Conventionally, as this type, the slope is covered with a net made of rope material combined vertically and horizontally and a wire mesh covering the length and width rope material, and the upper end of the vertical rope material and both ends of the horizontal rope material are fixed to the slope. When a force exceeding the holding friction force is applied by connecting each horizontal rope material and the vertical rope material at the crossing part of the vertical and horizontal rope material with a fixed holding force, and holding the rope material A rock fall prevention method (for example, Patent Document 1) in which a buffering action is generated by moving a part has been proposed.

  In addition, the pocket-type rockfall protection net is designed so that an opening is made by installing a support on the upper part of the wire mesh covering the slope, and rocks from the upper part of the slope are dropped into the opening. The snow covered in the area merges with the snow on the road surface in the daytime, and this causes excessive load by freezing at night, pulling the anchor rope anchor, tilting the hinged support, breaking the wire mesh There was a problem to do.

  Therefore, there is a pocket type rock fall prevention net for snow accumulation (for example, Patent Document 2) in which the net is divided into two or more stages in the vertical direction and the lower net part is lifted to the front side of the upper net part and suspended. Proposed.

JP 2002-227140 A Japanese Patent Laid-Open No. 10-168831

  In the above-mentioned snowfall pocket type rockfall prevention net, an excessive snow load is not applied to the net body during snow accumulation by pulling the lower side net part to the front side of the upper stage net part.

  However, in the pocket type rockfall prevention net for snow accumulation, the lower stage net part is rotated by a connecting means such as a shackle so that the lower stage net part can be pulled up to the front side of the upper stage net part. Since connection is possible, there is a problem that connection means is required and the structure becomes complicated. Also, after the hoisting, when there is no snow accumulation, it is necessary to lower the net again.

  Then, an object of this invention is to provide the falling rock protection net | network structure which can prevent that the excessive load by snow accumulation is added to a net body.

The invention according to claim 1 suspends a net body on an inclined surface, and the net body includes a horizontal rope member provided in a plurality of stages at intervals in the vertical direction, and a rock fall provided with a net covering these horizontal rope members In the protective mesh structure, the distance between the lower side rope members is made smaller than the distance between the upper side rope members, a plurality of suspension fulcrums are provided at the upper end of the mesh body, and a plurality of upper fixing means are provided above the suspension points. A plurality of continuous rope members between the upper fixing means and the suspension fulcrum, and the ends of the plurality of rope members are respectively anchored by anchors provided in the length direction of the rope members. A shock absorber that is fixed to the slope and that allows frictional sliding of the rope material when a predetermined tension or more is applied is provided in the middle of the rope material .

  The invention according to claim 2 is characterized in that an end portion of the lower side rope material is fixed to the slope.

  According to a third aspect of the present invention, when a tension of a predetermined level or more is applied in the middle of the horizontal rope member on the lower stage side due to a static load of snow, frictional sliding of an extra length portion of the lower side rope element is performed. A static load length adjusting tool is provided that allows and extends the lower side rope member corresponding to the surplus length part that has been slid by friction.

The invention according to claim 4 is characterized in that the upper fixing means is a plurality of anchors arranged vertically.

Moreover, the invention which concerns on Claim 5 is provided with the connecting member by which the said net body is provided with the vertical rope material provided in the crossing direction with respect to the said horizontal rope material, and the said vertical rope material and one end side are connected, and this connection member The other end side is connected, and the auxiliary anchor fixed to the said slope is provided.

According to the structure of Claim 1, it can support by the horizontal rope material which made the space | interval narrow in the lower side of the net | network body to which a heavy snow load is added, and this can respond to the snow load of the winter period as well as a falling rock. It becomes. In addition, when the net body receives the impact force of falling rocks, tension is generated in a plurality of continuous rope materials, and all anchors support the tension, and all anchors and rope materials counteract the force of falling rocks. . When a predetermined tension or more acts on the plurality of continuous rope members, the plurality of continuous rope members are frictionally slid and absorb the impact force in the shock absorber. Therefore, it is not necessary to provide a shock absorber on all rope members connected to the upper fixing means as in the prior art. In addition, by connecting an anchor to each of a plurality of continuous rope members, the force applied to one anchor can be distributed, and the applied load is reduced, so there is no need to use a large anchor, and damage to the anchor Can also be prevented. Furthermore, construction is easy and reliable fixing strength can be obtained by using a plurality of anchors provided in the length direction of the rope material on a slope where it is difficult to construct a large anchor due to restrictions on construction.

  Moreover, according to the structure of Claim 2, a snow load can be supported by the horizontal rope material which fixed both ends to the slope.

  According to the third aspect of the present invention, when the snow load becomes a predetermined value or more, a tension is generated in the horizontal rope material on the lower stage due to the static load. The horizontal rope material is extended by that amount, whereby the tension applied to the horizontal rope material and the force applied to the fixing portion of the horizontal rope material can be reduced.

Moreover, according to the structure of Claim 4 , construction is easy and reliable fixed strength by using several anchors arranged up and down with respect to the slope where it is difficult to construct a large anchor because it is restricted by construction. Can be obtained.

Further, according to the configuration of claim 5 , the mesh body and the auxiliary anchor are coupled via the connecting member, and the auxiliary anchor is installed on the slope, so that the transmission load applied to the mesh body can be dispersed. At the same time, it is possible to prevent the protrusion to the outside.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall plan explanatory view of a rock fall protection net structure showing Embodiment 1 of the present invention. It is a side view of a rock fall protection net structure same as the above. It is a side view of the upper part of a support | pillar same as the above. It is a top view of the upper part of a rock fall protection net structure same as the above. It is a top view of an anchor and a connection member same as the above. It is a side view of an upper fixing structure same as the above. It is a side view of an upper fixing structure same as the above. It is a side view which shows the fixation structure of the horizontal rope material of the upper stage side same as the above. It is a side view which shows the fixation structure of the horizontal rope material by the side of an interruption same as the above. It is a side view of a winding grip same as the above. It is a front view which shows the fixation structure of the horizontal rope material of a lower step side same as the above. It is a front view of a coupling tool same as the above. Id shows a pulley, Fig. 12 (A) is a front view, FIG. 12 (B) is a side view. It is a front view of a buffer (static load length adjustment tool) same as the above. It is a top view of a buffer tool (static load length adjustment tool) same as the above. It is a side view of the holding tool of a buffer tool (static load length adjustment tool) same as the above. It is a side view of a buffer (static load length adjustment tool) same as the above. It is a front view of the buffer (static load length adjustment tool) which has two holding tools same as the above. It is a front view of a loop part same as the above. It is a front view of a loop part same as the above. It is a side view of the buffer provided in a loop part same as the above. It is whole plane explanatory drawing of the rock fall protection structure which shows Example 2 of this invention. It is a side view of the falling rock protection structure. It is a side view which shows the fixation structure of an auxiliary anchor same as the above. It is a top view of an anchor and a connection member same as the above. It is a side view of an upper fixing structure same as the above. It is a side view of an upper fixing structure same as the above.

  Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention. In each embodiment, an unprecedented rockfall protection net structure is obtained by adopting a rockfall protection net structure different from the conventional one, and the rockfall protection net structure is described respectively.

Hereinafter, embodiments of the rock fall protection net structure of the present invention will be described with reference to FIGS. The rock fall protection net structure 1 includes a plurality of support columns 2 standing on the slope S and a net body 3 provided so as to cover the slope S. The struts 2 are erected at intervals in the left-right direction, the net body 3 is a horizontal rope member 5, 5A arranged in a mesh shape, and a vertical rope stretched in a direction intersecting the horizontal rope members 5, 5A. with product 4, these vertical rope materials 4, made horizontal rope materials 5,5A network serving wire mesh 6 which provided so as to close between, the vertical rope material 4 are arranged corresponding to the strut 2 ing. Reference numeral 5A denotes a lower side rope member.

  As shown in FIG. 2, a rock anchor 11 is fixed to the slope S, the support base 12 is fixed to the slope S by the anchor 11, and the lower part of the support 2 can be rotated by the pivot 13 to the support base 12. The support column 2 is configured to be tiltable in the front-rear direction (mountain valley direction).

  The upper part of the net body 3 is connected to the upper parts of the plurality of pillars 2, and specifically, the upper end of the vertical rope member 4 can be pivoted up and down by a pivotal coupling tool 14 such as a shackle. 2, and the uppermost horizontal rope member 5 of the mesh body 3 is connected to the upper portion of the support 2 at a connection point 15. As shown in FIG. 12, the rotary connector 14 includes a U-shaped metal fitting 14A and a connection shaft 14B that is detachably provided at the opening of the U-shaped metal fitting 14A.

  On the slope S on the mountain side above the support 2, anchors 21 and 21 are vertically installed at the position between the supports 2 and 2, and the distance between the supports 2 and 2 on the left and right outer sides of the supports 2 and 2 at both ends. Both end anchors 21A and 21A are installed in the length direction of the rope member 7 at a position about one half of the length of the rope material 7.

  As shown in FIGS. 5 and 6, the anchors 21 and 21 are connected to each other by a connecting member 61 whose length can be adjusted. The connecting member 61 is connected to both ends of a turnbuckle 62 with the rotary connecting members 14 and 14. Are connected to the anchors 21, 21 at the opposite ends thereof. In this case, the upper part of the anchor 21 is inserted into the rotation connecting part 14 and the anchor plate 65, and the nut 66 is screwed into the upper part of the anchor 21 to be connected. The anchors 21A and 21A are also connected by the connecting member 61.

  The anchor 21A, 21A and the connecting member 61 arranged in the length direction of the rope member 7 constitute an end fixing means 71, and the anchor 21, 21 and the connecting member 61 arranged in the vertical direction constitute an upper fixing means 72. Is configured.

  As shown in FIG. 1, between the anchors 21A, 21, 21, 21, 21, 21A and the struts 2, 2, 2, 2 and 2, the continuous rope members 7 and 7 are alternately bridged up and down alternately. The two rope members 7, 7 are arranged at positions that overlap each other.

  As shown in FIGS. 4 and 5, corresponding to the two rope members 7, 7, pulleys 23, 23 are provided on the anchor 21 below the upper fixing means 72 by connecting members 22, 22, respectively. The connecting body 22 includes the connecting tool 14 such as a shackle connected to the anchor 21, and a pulley frame 26 connected to the connecting tool 14 by a connecting shaft 14A serving as a lateral pivot. The pulley 23 rotates about a rotation center shaft 24, and the pulley 23 is provided so as to be swingable in the vertical direction about a connecting shaft 14B as a pivot.

  On the other hand, as shown in FIG. 4, pulleys 23A and 23A are provided at the upper ends of the columns 2 corresponding to the two rope members 7 and 7 by connecting bodies 22A and 22A, respectively. The connecting tool 14 such as a shackle that is rotatably connected to the anchor 21 by a connecting shaft 14B, and a pulley frame 26 that is connected to the connecting tool 14 so as to be swingable in the vertical direction are provided. The pulley 23A rotates about 24, and the pulley frame 26 swings with respect to the connector 14, whereby the pulley 23A is provided so as to be swingable in the vertical direction. The pulley 23A is a suspension fulcrum provided at the upper end of the net body 3.

  Then, the upper and lower rope members 7 and 7 are mounted on the corresponding pulleys 23 and 23A, respectively, and are alternately passed over the zigzag, and both ends of the rope member 7 are connected to the anchors 21A and 21A at the both ends. Note that the end of the rope member 7 and the anchor 21A on the lower side of the end fixing means 71 are connected by a rotating connector 14 and a turnbuckle 62 as shown in FIG. A rotating connector 14 is connected to the anchor 21A, and one end of the turnbuckle 62 is fixed to the rotating connector 14, and the winding grip 64 is made of a wire composed of a plurality of wires as shown in FIG. A loop portion 64A is formed in the middle portion, and both leg portions 64B, 64B connected to the loop portion 64A are twisted at a predetermined pitch. In use, the loop portion 64A is attached to the rotary connector 14. The leg portions 64B and 64B are connected by being sequentially wound along the twist of the end portion of the rope member 7 through the insertion.

  In the middle of the rope member 7, a shock absorber 8 is provided. In this example, the shock absorber 8 is provided between the anchors 21A at both ends and the pulleys 23 at both ends. 7 is divided to form divided end portions 7A and 7B, and the divided end portions 7A and 7B of the rope member 7 are connected by a buffer 8.

  The shock absorber 8 includes a pair of gripping bodies 34, 34 for gripping the rope material 7 with a predetermined frictional force, and a split end portion 7B of the rope material 7 is fitted to a mating surface of the gripping bodies 34, 34. The fitting grooves 35 and 35 to be formed are formed, and both gripping bodies 34 and 34 are fastened and fixed by fastening means 36 such as bolts and nuts. Engaging grooves 38 and 38 for engaging the U bolts 37 are formed on the side surfaces of the gripping bodies 34 and 34 fixed to each other, and both end portions 37T and 37T of the U bolt 37 are formed in the engaging grooves 38 and 38, respectively. Engage. Further, a plate 39 for inserting both end portions 37T, 37T of the U bolt 37 is provided, and a groove portion 40 for loosely inserting the end side 7B which is an extra length portion of the rope member 7 is formed in the plate 39. A gripping body 34, in which the U bolt 37 is connected to the ring portion 7W of the split end portion 7A of the rope member 7 and the end portion side 7B of the rope member 7 is fastened between both end portions 37T, 37T of the U bolt 37, 34 is inserted, the end portions 37T and 37T are inserted into the plate 39, and the nut 41 is screwed into the end portions 37T and 37T. The pair of gripping bodies 34, 34 constitutes a gripping tool 42 that grips the rope material 7 with a predetermined frictional force. As shown in FIG. 18, the shock absorber 8 includes the two gripping tools 42. , 42 may be provided side by side. In this way, a plurality of gripping tools 42 can be provided side by side on the U-bolt 37. Further, if the U-bolt 37 is lengthened, three or more gripping tools 42 can be provided side by side.

  Then, a stopper 43 that is locked to the gripping tool 42 is fixed to the split end portion 7B of the rope member 7. Accordingly, when an impact force such as falling rocks is applied to the net body 3 or the support column 2 and tension is generated in the rope material 7, the split end portion 7 </ b> B of the rope material 7 slides against the shock absorber 8, and this sliding is a stopper. It can be slid until 43 is locked to the gripping tool 42, and a part of energy can be absorbed by sliding.

  In particular, since the upper end of the support column 2 is supported by the continuous rope material 7 and the shock absorber 8 is provided in the middle of the continuous rope material 7, when falling rocks collide with the net body 3 or the support column 2, The tension is generated in the entire continuous rope material 7, and all the anchors 21, 21A support the tension, the anchors 21, 21A and the rope material 7 as a whole counteract the force of falling rocks and collide anywhere. However, when a tension exceeding a predetermined value is generated in the rope member 7, the rope member 7 frictionally slides on the shock absorbers 8 and 8 on both sides, and the impact force can be effectively absorbed. There is no need to provide a shock absorber on the material.

  In addition, since the two continuous rope members 7, 7 are used so as to overlap each other, strength against snow load as well as falling rocks can be secured. In this case, in the two rope members 7 and 7, by using the common connecting members 22, 22, 22A and 22A, the parts are shared, compared to the case of using one thick rope member, The rope members 7, 7 and related parts can be configured at low cost.

The rope 3 is provided with a plurality of horizontal rope members 5 and 5A between the upper end and the lower end thereof, and the anchors 21A are installed on the slopes S on the left and right sides of the horizontal rope members 5 and 5A. ing.

  Here, the characteristic structure which concerns on the horizontal rope materials 5 and 5A is demonstrated. As shown in FIG. 1, in the horizontal rope member 5, the interval K between the lower rope members 5A, 5A is set to be narrower than the interval K ′ between the upper rope members 5, 5. By narrowing the distance K between the lower side rope members 5A and 5A in this way, the snow load is handled by the horizontal rope members 5 and 5, and the influence on the upper structure can be reduced. Further, it is preferable to provide horizontal rope members 5A, 5A, 5A on the lower side of three or more stages (three) as in this embodiment.

  In addition, in the uppermost stage and the lower stage, two horizontal rope members 5 and 5 are arranged in each step, and as shown in FIG. The turnbuckle 62 is connected to the other end of the turnbuckle 62, and one end of the turnbuckle 62 is connected to the anchor 21A by the rotary connector 14. Further, the anchors 21A and 21A at both ends and the ends of the net body 3 are connected. In the meantime, the horizontal rope member 5 is provided with a buffer described later.

  Further, as shown in FIG. 9, both ends of the horizontal rope member 5 on the middle stage side are connected to the rotary connector 14 by the winding grip 64, and the rotary connector 14 is connected to the anchor 21A. ing.

  Further, the lower rope members 5A, 5A, 5A are connected to anchors 21A, 21A at both ends by a static load length adjusting tool 8A. The static load length adjusting tool 8A has the same configuration as that of the buffer 8. Then, as shown in FIG. 11, a U-bolt 37 of the static load length adjusting tool 8A is connected to the anchor 21A so as to be pivotable in the vertical direction. The stopper 43 is provided at the end of the long portion.

  Here, in the static load length adjusting tool 8A, a snow load (static load) is applied to the mesh body 3, whereby the lateral rope member 5 slides against the shock absorber 8A due to the tension applied to the transverse rope member 5. The shock absorber 8A is set to have a smaller frictional force for gripping the horizontal rope material 5 by the grip bodies 34, 34 than the shock absorber 8 of the middle horizontal rope material 5.

  In addition, as shown in FIG. 2, the lower end of the net body 3 is positioned at a height H of approximately 1 to 1.5 m from the lower end of the slope S, so that the net body 3 does not interfere with snow removal and snow removal. The influence of can be avoided. Further, the lower part of the mesh body 3 is arranged along the slope S so that the gap between the mesh body 3 and the slope S is reduced.

  Further, the holding rope material 9 is connected to the struts 2 and 2 at both ends. The holding rope material 9 has one end connected to the upper portion of the supporting column 2 and the other end connected to the anchor 21A at both ends and the uppermost horizontal rope material. 5 is connected to an anchor 21B disposed at a position between the anchor 21A and, more specifically, the end portion of the holding rope member 9 is connected to the connecting member 61 by a winding grip 64, and the connecting member 61 is connected to the anchor 21B. It is connected to the anchor 21B.

Further, as shown in FIGS. 1 and 19 , a loop portion 51 is formed in the middle of the horizontal rope member 5 and the holding rope member 9 on the upper side, and the horizontal rope member 5 of the overlapping portion 51A of the loop portion 51 is formed. , 5 is provided with one or a plurality of shock absorbers 52 that hold the pin 5 with a predetermined holding force. The shock absorber 52 includes grooves 54, 54 for fitting the horizontal rope members 5, 5 of the overlapping portion 51A at the joint of the pair of grip bodies 53, 53, and a bolt 55 inserted through the grip bodies 53, 53. The lateral rope members 5 and 5 of the overlapping portion 51A are gripped with a predetermined frictional force by tightening with a nut 56 screwed into the bolt 55.

  Further, a plurality of ring bodies 57 made of a hard material such as metal are loosely fitted to the horizontal rope member 5 of the loop portion 51, and a stopper 58 is fixed to the center of the loop portion 51. A plurality of the ring bodies 57 are arranged on both sides of the stopper 58 in substantially the same number.

  Then, when an impact force acts on the mesh body 3 and a tension of a predetermined level or more is generated on the horizontal rope member 5, the horizontal rope member 5 of the overlapping portion 51A slides in the direction in which the loop portion 51 contracts, and the friction force Impact force is absorbed. Further, the sliding is possible until the ring body 57 comes into contact with the stoppers 58, 58 and the gripping body 53. After the contact, the loop portion 51 is not further reduced, and the entire horizontal rope member The tensile strength of 5 does not decrease. That is, the horizontal rope member 5 is composed of a wire rope or the like, but due to the restriction by the ring body 57, there is no worry of bending even if the loop portion 51 is reduced to a predetermined curvature, and the tensile strength is lowered after sliding. Is prevented.

Further, an auxiliary horizontal rope member 44 is provided between the horizontal rope members 5, 5, 5A and 5A, and an auxiliary vertical rope member 45 is provided between the vertical rope members 4 and 4, and the surrounding vertical and horizontal rope members are provided. At the intersection of the vertical rope members 4,4 5 and the horizontal rope members 5,4 4 including 4,5,5A, the vertical and horizontal rope members 4,4 5 , 5,5A, 4 4 are It is connected.

Next, the operation of the configuration will be described. At the time of snow accumulation during winter, snow accumulates between the slope S and the net body 3, and a large snow load is applied to the lower part of the net body 3. In contrast, since the narrow gap K of the horizontal rope materials 5 A of the lower stage side, it is possible to support the snow load horizontal rope materials 5 A of the lower stage, the 5 A. Further, when the snow load reaches or exceeds a predetermined tensile force is generated in the horizontal rope materials 5 A of the lower side by the static load, exceeds the static friction force by the gripping member 34, 34 the tension grips the horizontal rope material 5 A When, the horizontal rope material 5 a relative gripper 42 is frictionally slid, that much elongation horizontal rope materials 5 a, to reduce the tensile force applied to the horizontal rope materials 5 a before such anchor 21B escapes Can do.

  In addition, since the slope S is restricted by construction, it is difficult to construct a large anchor, but two anchors 21, 21 or 21A, 21A are arranged side by side, and both anchors 21, 21, 21A, 21A are connected by a connecting member 61. By connecting, reliable mounting strength can be obtained. Further, since the connecting member 61 is provided with the rotating connecting members 14 and 14 on both sides of the turnbuckle 62 whose length can be adjusted, the anchors 21 and 21 can be securely attached in response to the unevenness between the anchors 21 and 21. Can be linked.

In this embodiment this way, suspended the mesh member 3 slopes S, netting 3, the horizontal rope materials 5,5 · · · 5A provided in a plurality of stages spaced vertically, and 5A, In the rock fall protection net structure 1 provided with the wire net 6 that covers the horizontal rope members 5, 5... 5A, 5A, the distance K between the lower side rope members 5A, 5A is set to the upper side rope member 5. , 5 can be supported by the horizontal rope members 5A, 5A having a narrow interval K on the lower side of the net body 3 to which a heavy snow load is applied. It becomes possible to cope with the snow load of the period.

Further, in the present embodiment in this manner, can be from fixing the ends of the horizontal rope materials 5A of the lower stage side slopes S, to support the snow load by horizontal rope materials 5A fixed at both ends to the slope S.

Also, in this way this embodiment, in the middle of the horizontal rope materials 5A of the lower stage side, the frictional sliding of the elongated portion of the lower horizontal rope materials 5A when a predetermined or more tensile force by static load of snow is applied And a static load length adjusting tool 8A that extends the lower horizontal rope member 5A in correspondence with the surplus length part that has been slid by friction, is provided. When the tension is generated in the lateral rope members 5A and 5A on the side, and the tension exceeds a predetermined value, the lateral rope members 5A and 5A slide frictionally, and the lateral rope members 5A and 5A extend and bend by that amount. It is possible to reduce the tension applied to the rope members 5A and 5A and the force applied to the anchor 21A which is a fixing portion of the horizontal rope members 5A and 5A.

Also, with the upper end of the netting 3 provide a plurality of hanging fulcrum serving support 2, a plurality of upper fixing means 72 placed on the upper side of the mountain side, continuous between the tower 2 and these upper fixed unit 72 When the rope material 7 is bridged up and down alternately, the end portion of the rope material 7 is fixed to the slope S by the end fixing means 71, and when a predetermined tension or more is applied in the middle of the rope material 7, the rope material 7 Is provided, and the end fixing means 71 includes a plurality of anchors 21, 21 arranged in the length direction of the rope member 7, so that the net body 3 receives the impact force of falling rocks. Then, tension is generated in the continuous rope material 7, and all the anchors 21, 21A support the tension, and all the anchors 21, 21A and the rope material 7 counteract the force of falling rocks. When a predetermined tension or more acts on the continuous rope member 7, the rope member 7 frictionally slides in the shock absorber 8 to absorb the impact force. Therefore, it is not necessary to provide the shock absorbers 8 on all the rope members 7 connected to the upper fixing means 72 as in the prior art. In addition, since the slope S is restricted by construction, it is difficult to construct a large anchor, but by using a plurality of anchors 21A, 21A arranged in the length direction of the rope member 7, construction is easy and reliable. Fixed strength is obtained.

  Further, since the upper fixing means 72 includes a plurality of anchors arranged vertically, it is difficult to construct a large anchor because the slope S is restricted by construction, but a plurality of anchors 21, 21 arranged vertically are arranged. By using it, construction is easy and reliable fixing strength can be obtained.

Hereinafter, as an effect of the embodiment, the upper end of the net body 3 is fixed to a plurality of support columns 2 erected on the ground, and a plurality of upper fixing means 72 and end fixing means 71 are provided above the mountain side. Since the pulleys 23 and 23A are attached to the upper fixing means 72 and the end fixing means 71 and the support column 2 respectively, and the continuous rope material 7 is bridged up and down alternately via the pulleys 23 and 23A, the net body 3 or When the strut 2 receives the impact force of falling rock, tension is generated in the continuous rope material 7, and all the anchors 21, 21A support the tension, and all the upper fixing means 72, the end fixing means 71 and the rope material. 7 counters the power of falling rocks. When a predetermined tension or more acts on the continuous rope member 7, the rope member 7 frictionally slides in the shock absorber 8 to absorb the impact force. Therefore, it is not necessary to provide a shock absorber on all the rope members connected to the anchor as in the prior art.

  In addition, since the end of the horizontal rope member 5 of the net body 3 which is a protective net is fixed and the shock absorber 8 is provided on the end side of the horizontal rope member 5, the net member 3 receives the impact force of falling rocks and the horizontal rope member. When a predetermined tension or more acts on 5, the rope member 5 frictionally slides in the shock absorber 8 to absorb the impact force.

  In addition, since the loop portion 51 is formed in the middle of the horizontal rope member 5 and the loop portion buffer 52 that holds the overlapping portion 51A of the horizontal rope member 5 of the loop portion 51 with a predetermined frictional force, the net body 3 is provided. When a predetermined tension or more is applied to the horizontal rope member 5 due to the impact force of falling rocks, the loop portion 51 shrinks, and the horizontal rope member 5 frictionally slides in the overlapping portion 51A to absorb the impact force.

Further, the anchors 21B and 21B are provided above the struts 2 and 2 at both ends and on the left and right outer sides of the struts 2 and 2 at both ends. Since the shock absorber 52 is provided in the middle of 9, when the impact force of falling rocks is applied to the net body 3 or the support column 2 and a tension of a predetermined level or more acts on the shock rope material 9, the shock rope material 9 is frictionally slid in the shock absorber 52 . Move to absorb impact force. Moreover, since the stay rope material 9 is arranged toward the left and right outer sides, the support column 2 can be prevented from falling in the left and right direction.

Further, the loop portion 51, because they provide a plurality of rings 57 on either side of the stopper 58, after contact with that bunch bearing member 53 the ring member 57, without the loop portion 51 is reduced more, As a whole, the tensile strength of the horizontal rope material 5 does not decrease. Further, since the support column 2 can be tilted and the pulleys 23 and 23A are also provided so as to be swingable in the vertical direction, the continuous rope material 7 can be effectively operated even if the support column 2 is tilted.

  22 to 27 show a second embodiment of the present invention, in which the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the first embodiment, two continuous rope members 7 and 7 are fixed to the slope S by being connected to one anchor 21 so as to overlap each other. The continuous rope members 7 and 7 are connected to separate anchors 21C and 21C, respectively, to be fixed to the slope S.

  As shown in FIGS. 22 and 23, the anchors 21C and 21C connecting the two continuous rope members 7 and 7 are installed on the slope S so as to be in the vertical position. Moreover, the lengths of the two continuous rope members 7 and 7 connected to the anchors 21C and 21C are different from each other, and are installed without being overlapped vertically. In this way, since the force applied to one anchor 21C can be dispersed, the load applied to the anchor 21C is reduced, and damage to the anchor 21C can be prevented.

  In addition, in this embodiment, auxiliary anchors 81 are installed on the slope S. The auxiliary anchor 81 is installed in order to prevent the net 3 from protruding to the outside caused when snow or the like accumulates between the net 3 and the slope S and a static load is applied to the net 3. Is done.

  Specifically, the vertical rope members 4, 4 included in the net body 3 are connected to one end side of a connecting member 82 made of a wire rope or the like by a connecting tool 14 such as a shackle, and the other end side of the connecting member 82 is connected to an auxiliary anchor 81. And connected by a connector 14. That is, the vertical rope members 4 and 4 included in the net body 3 are connected to the auxiliary anchor 81 installed on the slope S through the connection member 82. And the auxiliary anchor 81 is installed in the slope S located above the connection tool 14 which connects the vertical rope members 4 and 4 and the one end side of the connection member 82. With such a configuration, it is possible to disperse the transmission load applied to the net body 3 and to prevent the protrusion to the outside.

  Further, in this embodiment, as shown in FIG. 24, the vertical ropes 4, 4 and the connection member 82 are stabilized by providing a plurality of coupling tools 14 that connect the vertical ropes 4, 4 and one end side of the connection member 82. Can be connected together.

Thus, in this embodiment, before Kimotai 3 a plurality of hanging fulcrum serving strut 2 is provided on the upper end of, installing a plurality of upper fixing means 72 thereabove, these upper fixing means 72 and the support 2 A plurality of continuous rope members 7 and 7 are alternately bridged between them, and anchors 21C and 21C provided with end portions of the rope members 7 and 7 in the length direction of the rope members 7 and 7, respectively. Since the shock absorber 8 is provided in the middle of the rope member 7 to permit frictional sliding of the rope member 7 when a tension higher than a predetermined level is applied, the net body 3 has the impact force of falling rocks. When receiving, tension is generated in a plurality of continuous rope members 7, 7 and all anchors 21C, 21C support the tension, and all the anchors 21C, 21C and the entire rope member 7 counteract the force of falling rocks. To do. When a predetermined tension or more acts on the continuous rope member 7, the rope member 7 frictionally slides in the shock absorber 8 to absorb the impact force. Therefore, it is not necessary to provide the shock absorbers 8 on all the rope members 7 connected to the upper fixing means 72 as in the prior art. In addition, by connecting the anchors 21C and 21C to each of the plurality of continuous rope members 7 and 7, the force applied to one anchor 21C can be dispersed and the applied load is reduced, so a large anchor is used. There is no need to prevent the anchor from being damaged. Furthermore, construction is easy and reliable by using multiple anchors 21C and 21C provided in the length direction of the rope material 7 on the slope S where it is difficult to construct large anchors due to restrictions on construction. Strength is obtained.

Thus, in this embodiment, before Symbol upper fixing means 72, a plurality of anchor 21C aligned vertically, because it is 21C, with respect to the inclined surface S it is difficult to construction a large anchor for restricted to construction, vertical By using a plurality of anchors 21C and 21C arranged in a row, construction is easy and reliable fixing strength can be obtained.

Thus, in this embodiment, before Kimotai 3 is provided with a vertical rope materials 4, 4 provided in the intersecting direction with respect to the horizontal rope materials 5,5, the vertical rope materials 4, 4 and one end connected Since the connecting member 82 is connected to the other end of the connecting member 82 and the auxiliary anchor 81 is fixed to the slope S, the transmission load applied to the mesh body 3 can be dispersed. The protrusion to the outside can be prevented.

As mentioned above, although each Example of this invention was explained in full detail, this invention is not limited to the said Example, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, the static load length adjusting tool is not limited to the embodiment, and various types of static load length adjusting tools can be used. It is also possible to provide a fulcrum hanging in addition to the standoff. In the embodiment, two shock absorbers are provided on the continuous rope material, but the number thereof may be one, and it is sufficient that it is at least smaller than the number of support columns. Note that one end side of the connecting member 82 is connected to the vertical rope member between the vertical rope members 4 and 4 by the connecting tool 14, and the other end side of the connecting member 82 is connected to the auxiliary anchor 81 by the connecting tool 14. Good.

1 Rockfall protection structure 2 Prop 3 Net body (Rockfall protection net)
4 Vertical rope material 5 Horizontal rope material 5A Horizontal rope material on the lower side 6 Wire mesh (net)
7 Continuous rope material 8 Shock absorber 8A Static load length adjuster 9 Reservoir rope material
14 Rotating coupling
21 Anchor
21A Anchor
22 Connected body
23 pulley (support side)
23A pulley (hanging fulcrum)
51 Loop section
51A Superposition part
52 Loop cushioning
61 Connecting members
62 Turnbuckle
71 End fixing means
72 Upper fixing means
81 Auxiliary anchor
82 Connection member K Interval (Lower side)
K 'interval

Claims (5)

A rock fall protection net structure comprising a net body suspended from a slope, the net body having a horizontal rope material provided in a plurality of stages at intervals in the vertical direction, and a net covering these horizontal rope materials, The distance between the horizontal rope members is made narrower than the distance between the horizontal rope members on the upper end side , a plurality of suspension fulcrums are provided at the upper end of the mesh body, and a plurality of upper fixing means are installed above the upper supporting means. A plurality of continuous rope members are alternately bridged between the suspension fulcrum and the ends, and the ends of the rope members are fixed to the slope by anchors provided in the length direction of the rope members, respectively. A rock fall protection net structure characterized in that a shock absorber is provided in the middle of the material to allow frictional sliding of the rope material when a predetermined tension or more is applied . The falling rock protection net structure according to claim 1, wherein an end portion of the lower side rope member is fixed to the slope. In the middle of the horizontal rope material on the lower side, when a predetermined tension or more is applied by a static load of snow, the frictional sliding of the extra length portion of the horizontal rope material on the lower side is allowed, and the extra length of the friction sliding The falling rock protection net structure according to claim 1 or 2, further comprising a static load length adjusting tool for extending the lower side rope member corresponding to the portion. The rock fall protection net structure according to any one of claims 1 to 3, wherein the upper fixing means is a plurality of anchors arranged vertically. The net body is provided with a vertical rope member provided in a crossing direction with respect to the horizontal rope member, the connecting member connected to the vertical rope member and one end side, and the other end side of the connecting member are connected, The fall rock protection structure according to any one of claims 1 to 4 , further comprising an auxiliary anchor fixed to the slope.

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